Question

How many groups and periods are there in a long form periodic table ?How are these numbered? How many elements are there in each period?

#chemistry10th
#periodicclassificationofelements​

Answer 1

Answer:

THERE are 7 periods and 18 groups

They are given numbers according to their atomic number

Thare are 2 elements in first period, 8 in 2nd period, 8 in 3rd period, 18 elements in 4th period, 18 in 5th period, 32 in 6th period,

In seventh period there are temporarily 4 elements including them at present there are 32 elements

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